It is basically a softening of the brain matter as a result of an ischemia or infarction, degenerative changes, infection, craniocerebral trauma, or other injury. Thus any damage to this lobe can lead to
long term memory loss, mood swings, talking too much, and energy bursts leading to over activity. If the MRI of brain is done and it shows an injury to frontal lobe of the brain, then your behavior changes can be explained by the injury.